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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ca899bab5c742a56f932213b1b8e33463bebd2208943497ba9cc4db706de0e' 
  AND token = 'Eh/8GyCcDVSRlCrmstvNDXewlL9IR5tnu7hJ+Hh1/Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}